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French Onion Chicken Orzo Casserole

French onion chicken orzo casserole with deeply caramelized onions and tender orzo simmered in a creamy broth. Finished with bubbly, golden mozzarella, this one-skillet bake delivers cozy French onion soup flavor in casserole form.
Prep Time 45 minutes
Cook Time 40 minutes
Total Time 1 hour 25 minutes
Servings: 6 servings
Course: Dinner
Cuisine: French
Calories: 690

Ingredients
  

Butter
  • 2 tbsp butter
Olive oil
  • 1 tbsp olive oil
Yellow onions
  • 3 yellow onions thinly sliced
Sugar
  • 1 tsp sugar
Salt
  • 0.25 tsp salt to taste
Garlic
  • 3 garlic minced
Orzo pasta
  • 1.5 cup orzo pasta
Shredded cooked chicken
  • 2 cup shredded cooked chicken
Fresh thyme
  • 1 tsp fresh thyme
Chicken broth
  • 3 cup chicken broth
Heavy cream
  • 1 cup heavy cream
Mozzarella cheese
  • 1.5 cup shredded mozzarella cheese divided
Parmesan cheese
  • 0.5 cup grated Parmesan cheese

Equipment

  • 1 cast iron skillet

Method
 

Caramelize the onions
  1. Melt the butter and olive oil in a large oven-safe skillet over medium heat, then add the onions, sugar, and salt. Stir to coat the onions and distribute the seasoning evenly, with the onions starting to soften right away.
  2. Cook the onions for 20 to 25 minutes, stirring occasionally, until deeply golden and caramelized, adding the garlic in the last 2 minutes. Keep the heat at medium so the fond darkens without burning.
Simmer the orzo casserole base
  1. Stir in the orzo and toast for 2 minutes, then add the shredded chicken and thyme. The orzo should smell lightly toasted and begin to pick up the onion flavors.
  2. Pour in the chicken broth and cream, bring to a simmer, then cover and cook for 8 to 10 minutes until the orzo is tender. Watch for gentle bubbling and an orzo texture that’s cooked through.
Finish with cheese and bake
  1. Stir in 1 cup of mozzarella and the Parmesan until melted and creamy. The mixture should look glossy and thickened from the cheese and cream.
  2. Preheat the oven to 375°F, top with the remaining mozzarella, and bake uncovered for 10 to 15 minutes until bubbly and golden. Look for browned melted cheese edges and active bubbling in the center.

Notes

For best flavor, slice onions evenly so they caramelize at the same rate. Store leftovers in the refrigerator up to 3 days; reheat gently in the microwave or a skillet until hot. Freezing isn’t recommended because creamy orzo can lose texture after thawing. For a lighter option, use half-and-half instead of heavy cream and consider reduced-fat mozzarella.